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<a href="native__socket__stream__acceptor_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow-IPC: Core</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;<a class="code" href="transport__fwd_8hpp.html">ipc/transport/transport_fwd.hpp</a>&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &quot;<a class="code" href="native__socket__stream_8hpp.html">ipc/transport/native_socket_stream.hpp</a>&quot;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="preprocessor">#include &quot;<a class="code" href="asio__local__stream__socket__fwd_8hpp.html">ipc/transport/asio_local_stream_socket_fwd.hpp</a>&quot;</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="preprocessor">#include &quot;<a class="code" href="shared__name_8hpp.html">ipc/util/shared_name.hpp</a>&quot;</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="preprocessor">#include &lt;flow/async/single_thread_task_loop.hpp&gt;</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="preprocessor">#include &lt;queue&gt;</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="preprocessor">#include &lt;utility&gt;</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span> </div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceipc_1_1transport.html">ipc::transport</a></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span>{</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment">// Types.</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><span class="comment"></span> </div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment">/**</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment"> * A server object that binds to a `Shared_name` and listens for incoming `Native_socket_stream` connect</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="comment"> * attempts to that name; and yields connected-peer sync_io::Native_socket_stream objects, one per counterpart</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span><span class="comment"> * opposing `*_connect()`.</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span><span class="comment"> *</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment"> * @note The method is async_accept(); and it yields a PEER-state sync_io::Native_socket_stream object.</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment"> *       Such an object is called a `sync_io` *core*.  It is often more convenient to work with an async-I/O-pattern</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span><span class="comment"> *       object of type Native_socket_stream -- it&#39;ll perform work in the background without intervention, etc.</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment"> *       To get this simply do: `Native_socket_stream async_x(std::move(sync_x))`, where</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment"> *       `sync_x` is the aforementioned PEER-state object of type `sync_io::Native_socket_stream`.</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment"> *       (`sync_x` then becomes as-if-default-constructed again.  You can even async_accept() into it again.)</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="comment"> * @note Depending on your context you may also bundle `sync_x` into Channel `sync_c` -- then create an</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment"> *       async-I/O-pattern Channel via: `auto async_c = sync_c.async_io_obj()`.</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment"> *</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment"> * @see Native_socket_stream doc header.</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment"> * @see Native_socket_stream::sync_connect() doc header.</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment"> *</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment"> * This object is straightforward to use, and really the only difficulty comes from (1) choosing a `Shared_name` and</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment"> * (2) the other side knowing that name.  Before deciding to use it and how to use it, it is essential to read</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment"> * the &quot;How to use&quot; section of Native_socket_stream doc header.  It discusses when to use this, versus an easier</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment"> * (name-free) way to yield a connected-peer Native_socket_stream.  As you&#39;ll see, the only difficulty in using the</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment"> * latter is that it does require a *one*-time use of Native_socket_stream_acceptor after all.  However</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment"> * ipc::session takes care of that internally -- so you would not need to set up a Native_socket_stream_acceptor</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment"> * after all.</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment"> *</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment"> * So all in all:</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span><span class="comment"> *   - If you&#39;ve got ipc::session stuff, you don&#39;t need Native_socket_stream_acceptor: you can just open</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment"> *     a Channel with a native-handles pipe; it&#39;ll contain a PEER-state Native_socket_stream.</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment"> *   - If you are operating outside ipc::session then this guy here will let you set up a client/server mechanism</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span><span class="comment"> *     for `Native_socket_stream`s.</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span><span class="comment"> *</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment"> * @todo At the moment, *if* one decides to use a Native_socket_stream_acceptor directly -- not really necessary</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment"> * given ipc::session `Channel`-opening capabilities -- the the user must come up with their own naming scheme</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment"> * that avoids name clashes; we could supply an ipc::session-facilitated system for providing this service instead.</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"> * I.e., ipc::session could either expose a facility for generating the `Shared_name absolute_name` arg to</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span><span class="comment"> * the Native_socket_stream_acceptor ctor (and opposing Native_socket_stream::sync_connect() call).  Alternatively</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span><span class="comment"> * it could provide some kind of Native_socket_stream_acceptor factory and corresponding opposing facility.</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span><span class="comment"> * Long story short, within the ipc::session way of life literally only one acceptor exists, and it is set up</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment"> * (and named) internally to ipc::session.  We could provide a way to facilitate the creation of more</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment"> * acceptors if desired by helping to choose their `Shared_name`s.  (An original &quot;paper&quot; design did specify</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment"> * a naming scheme for this.)</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment"> *</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment"> * @internal</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span><span class="comment"> * ### Implementation ###</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span><span class="comment"> * It is fairly self-explanatory.  Historic note: I (ygoldfel) wrote this after the far more complex</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span><span class="comment"> * Native_socket_stream.  We do use the same concepts here: The ctor immediately starts a thread that reads off</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment"> * all incoming connects ASAP.  There is a surplus queue of such connects; and a deficit queue of pending</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span><span class="comment"> * async_accept() requests from user.  A steady state is maintained of either an empty surplus and possibly non-empty</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment"> * deficit; or vice versa.  However there are no heavy-weight buffers involved, so copy avoidance is not a factor --</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment"> * it is pretty simple.  Also there is no outgoing-direction pipe which further cuts complexity in at least half.</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment"> *</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment"> * Later, after the `sync_io` pattern was introduced, Native_socket_stream was split into</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment"> * Native_socket_stream (identical API and semantics) and `sync_io` core sync_io::Native_socket_stream; and</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="comment"> * the latter&#39;s core logic was moved to reused-elsewhere sync-to-async adapters sync_io::Async_adapter_sender</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span><span class="comment"> * and sync_io::Async_adapter_receiver.  Furthermore (and this is more relevant here) internally</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span><span class="comment"> * the latter guy was changed *away* from reading as many in-messages as were available in the kernel receive buffer --</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span><span class="comment"> * even when no `async_receive_*()` user requests were pending.  (Before the change: Such &quot;cached&quot; messages would</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment"> * need to be copied and stored until the user requests came -- a/k/a the *surplus* was resolved.)  So that was</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment"> * changed; it would only read enough messages to satisfy the currently outstanding `async_receive_*()`s.  The</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment"> * rest would be left in the kernel buffer.  In other words there could be a *deficit* still; but there could never</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment"> * be a *surplus* in that changed (internal) design.</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span><span class="comment"> *</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span><span class="comment"> * Now, despite that change, Native_socket_stream_acceptor was left unchanged.  It still, internally, accepts</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span><span class="comment"> * as many as are available; and caches a surplus internally if one occurs (until async_accept() x N come in to</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="comment"> * balance it iout).  The rationale?  Well, it was just a good feature.  There&#39;s no copying (of anything sizable)</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment"> * involved, and it seemed like a decent idea to not leave handles languishing in some kernel queue.  Essentially</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment"> * the reasoning for that change inside Native_socket_stream (and Blob_stream_mq_receiver) -- well outside our scope</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment"> * here -- simply did not apply to Native_socket_stream_acceptor.</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment"> */</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html">  102</a></span><span class="keyword">class </span><a class="code hl_class" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html">Native_socket_stream_acceptor</a> :</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span>  <span class="keyword">public</span> flow::log::Log_context,</div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span>  <span class="keyword">private</span> boost::noncopyable</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span>{</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="keyword">public</span>:</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment"></span> </div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment">  /// Short-hand for type of target peer-socket objects targeted by async_accept().</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a3707eaee28b6bacded15ba4cdab3da48">  110</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_class" href="classipc_1_1transport_1_1sync__io_1_1Native__socket__stream.html">Peer</a> = <a class="code hl_typedef" href="classipc_1_1transport_1_1Native__socket__stream.html#a850af22a95f27d8696b9b5bca15454b5">Native_socket_stream::Sync_io_obj</a>;</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="comment"></span> </div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="comment">  /// Useful for generic programming, the `sync_io`-pattern counterpart to `*this` type.</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ac0e1478364d940f243acece27ece5a7c">  113</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_class" href="classipc_1_1transport_1_1sync__io_1_1Native__socket__stream__acceptor.html">Sync_io_obj</a> = <a class="code hl_class" href="classipc_1_1transport_1_1sync__io_1_1Native__socket__stream__acceptor.html">sync_io::Native_socket_stream_acceptor</a>;<span class="comment"></span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span><span class="comment">  /// You may disregard.</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a863aa3fe53c71e3b33814f7caecbb193">  115</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_class" href="classipc_1_1transport_1_1Null__peer.html">Async_io_obj</a> = <a class="code hl_class" href="classipc_1_1transport_1_1Null__peer.html">Null_peer</a>;</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span> </div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>  <span class="comment">// Constants.</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span><span class="comment"></span> </div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span><span class="comment">  /// `Shared_name` relative-folder fragment (no separators) identifying this resource type.</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a0de2b6072026584ff1d46538533ed68b">  120</a></span><span class="comment"></span>  <span class="keyword">static</span> <span class="keyword">const</span> <a class="code hl_class" href="classipc_1_1util_1_1Shared__name.html">Shared_name</a>&amp; <a class="code hl_variable" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a0de2b6072026584ff1d46538533ed68b">S_RESOURCE_TYPE_ID</a>;</div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span> </div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>  <span class="comment">// Constructors/destructor.</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span><span class="comment"></span> </div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span><span class="comment">   * Creates the Native_socket_stream_acceptor and immediately begins listening in the background, so that other</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="comment">   * process(es) can connect to it -- at the specified name -- once the constructor returns successfully.</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span><span class="comment">   * The operation may fail; see `err_code` arg for how to detect this (either exception or via code return;</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span><span class="comment">   * your choice).  An error will be logged on failure.</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span><span class="comment">   *</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span><span class="comment">   * On success, opposing processes can attempt Native_socket_stream::sync_connect() (or</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="comment">   * sync_io::Native_socket_stream::sync_connect()) which will quickly succeed</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span><span class="comment">   * yielding an opposing #Peer which will be connected.  On this side, async_accept() is used to grab</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span><span class="comment">   * local peer #Peer.  The connection need not have an async_accept() pending to complete connection</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span><span class="comment">   * as observed by the opposing process.</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span><span class="comment">   *</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span><span class="comment">   * Assuming this ctor succeeds, further background operation may detect an unrecoverable error.  If this occurs,</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span><span class="comment">   * it will occur exactly once, and it is guaranteed no connections will be accepted subsequently; `async_accept()`s</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span><span class="comment">   * beyond that point (once all successfully queued-up connects, if any, are exhausted) will fail with that error.</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span><span class="comment">   *</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="comment">   * `absolute_name` should be considered carefully.  It cannot clash with another acceptor in existence, and it</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span><span class="comment">   * might even be a mediocre idea to clash with one that *has* recently existed.  Plus the opposing</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span><span class="comment">   * Native_socket_stream (or sync_io::Native_socket_stream) needs to know `absolute_name`.</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="comment">   *</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span><span class="comment">   * ### Rationale/context ###</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span><span class="comment">   * An Native_socket_stream_acceptor is unlikely to be used except by ipc::session, internally, in any case.</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="comment">   * Once a session is established, one is ~certain to use ipc::transport::Channel to establish connections, and that</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span><span class="comment">   * intentionally avoids Native_socket_stream_acceptor, because then one need not worry about this thorny naming issue.</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span><span class="comment">   * Nevertheless we provide Native_socket_stream_acceptor as a public API, in case it&#39;s generally useful.</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span><span class="comment">   *</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span><span class="comment">   * @param logger_ptr</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span><span class="comment">   *        Logger to use for subsequently logging.</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span><span class="comment">   * @param absolute_name</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span><span class="comment">   *        The absolute name at which to bind and listen for connections.</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span><span class="comment">   * @param err_code</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span><span class="comment">   *        See `flow::Error_code` docs for error reporting semantics.  #Error_code generated:</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span><span class="comment">   *        `boost::asio::error::invalid_argument` (Native_socket_stream_acceptor failed to initialize specifically:</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span><span class="comment">   *        because the given or computed address/name ended up too long to fit into natively-mandated data structures;</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span><span class="comment">   *        or because there are invalid characters therein, most likely forward-slash),</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span><span class="comment">   *        `boost::asio::error::address_in_use` (Native_socket_stream_acceptor failed to initialize due</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span><span class="comment">   *        to a name clash), possibly other system codes (Native_socket_stream_acceptor failed to initialize for some</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span><span class="comment">   *        other reason we could not predict here, but whatever it was was logged).</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span><span class="comment">   */</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span>  <span class="keyword">explicit</span> <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a77795acb028a95a4804f9b3ef18d99b0">Native_socket_stream_acceptor</a>(flow::log::Logger* logger_ptr, <span class="keyword">const</span> <a class="code hl_class" href="classipc_1_1util_1_1Shared__name.html">Shared_name</a>&amp; <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ac5b70ff8230fa49c99ccb6954db71c75">absolute_name</a>,</div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span>                                         <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>* err_code = 0);</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span><span class="comment"></span> </div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span><span class="comment">   * Destroys this acceptor which will stop listening in the background and cancel any pending</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span><span class="comment">   * completion handlers by invoking them ASAP with error::Code::S_OBJECT_SHUTDOWN_ABORTED_COMPLETION_HANDLER.</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span><span class="comment">   *</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">   * You must not call this from directly within a completion handler; else undefined behavior.</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span><span class="comment">   *</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span><span class="comment">   * Each pending completion handler will be called from an unspecified thread that is not the calling thread.</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span><span class="comment">   * Any associated captured state for that handler will be freed shortly after the handler returns.</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span><span class="comment">   *</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span><span class="comment">   * We informally but very strongly recommend that your completion handler immediately return if the `Error_code`</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span><span class="comment">   * passed to it is error::Code::S_OBJECT_SHUTDOWN_ABORTED_COMPLETION_HANDLER.  This is similar to what one should</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span><span class="comment">   * do when using boost.asio and receiving the conceptually identical `operation_aborted` error code to an</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span><span class="comment">   * `async_...()` completion handler.  In both cases, this condition means, &quot;we have decided to shut this thing down,</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span><span class="comment">   * so the completion handlers are simply being informed of this.&quot;</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span><span class="comment">   */</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span>  <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a71e907b904bcc8aff0042ca7efcc783b">~Native_socket_stream_acceptor</a>();</div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span> </div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno">  183</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="comment"></span> </div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span><span class="comment">   * Returns the full name/address to which the constructor bound, or attempted to bind, the listening socket.</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span><span class="comment">   *</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span><span class="comment">   */</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span>  <span class="keyword">const</span> <a class="code hl_class" href="classipc_1_1util_1_1Shared__name.html">Shared_name</a>&amp; <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ac5b70ff8230fa49c99ccb6954db71c75">absolute_name</a>() <span class="keyword">const</span>;</div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno">  191</span><span class="comment"></span> </div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment">   * Asynchronously awaits for a peer connection to be established and calls `on_done_func()`,</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span><span class="comment">   * once the connection occurs, or an error occurs, in the former case move-assigning a PEER-state</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span><span class="comment">   * Native_socket_stream object to the passed-in Native_socket_stream `*target_peer`.</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment">   * `on_done_func(Error_code())` is called on success.  `on_done_func(E)`, where `E` is a non-success</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span><span class="comment">   * error code, is called otherwise.  In the latter case `*this` has met an unrecoverable error and should</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno">  198</span><span class="comment">   * be shut down via the destructor, as no further `async_accept()`s</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span><span class="comment">   * will succeed (they&#39;ll quickly yield the same error).</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span><span class="comment">   *</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span><span class="comment">   * Multiple async_accept() calls can be queued while no connection is pending;</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span><span class="comment">   * they will grab incoming connections in FIFO fashion as they arrive.</span></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span><span class="comment">   *</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span><span class="comment">   * The aforementioned #Peer generated and move-assigned to `*target_peer` on success shall</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span><span class="comment">   * inherit `this-&gt;get_logger()` as its `-&gt;get_logger()`; and its sync_op::Native_socket_stream::nickname() shall be</span></div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span><span class="comment">   * something descriptive.</span></div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span><span class="comment">   *</span></div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span><span class="comment">   * `on_done_func()` shall be called from some unspecified thread, not the calling thread, but never concurrently with</span></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span><span class="comment">   * other such completion handlers.  Your implementation must be non-blocking.  Informally we recommend it place the</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span><span class="comment">   * true on-event logic onto some task loop of your own; so ideally it would consist of essentially a single `post(F)`</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span><span class="comment">   * statement of some kind.  There are certainly reasons to not follow this recommendation, though, in some use cases.</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span><span class="comment">   *</span></div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span><span class="comment">   * `on_done_func()` *will* be called; at the latest when the destructor is invoked (see below).</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno">  214</span><span class="comment">   *</span></div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span><span class="comment">   * You may call this from directly within a completion handler.  Handlers will still always be called</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span><span class="comment">   * non-concurrently, and a handler will never be called from within a handler (so it is safe, e.g., to bracket</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span><span class="comment">   * your handler with a non-recursive mutex lock).</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span><span class="comment">   *</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span><span class="comment">   * #Error_code generated and passed to `on_done_func()`:</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno">  220</span><span class="comment">   * error::Code::S_OBJECT_SHUTDOWN_ABORTED_COMPLETION_HANDLER (destructor called, canceling all pending ops;</span></div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span><span class="comment">   * spiritually identical to `boost::asio::error::operation_aborted`),</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span><span class="comment">   * other system codes most likely from `boost::asio::error` or `boost::system::errc` (but never</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span><span class="comment">   * would-block), indicating the underlying transport is hosed for that specific reason.</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span><span class="comment">   *</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span><span class="comment">   * @tparam Task_err</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno">  226</span><span class="comment">   *         Handler type matching signature of `flow::async::Task_asio_err`.</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span><span class="comment">   * @param target_peer</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span><span class="comment">   *        Pointer to sync_io::Native_socket_stream which shall be assigned a PEER-state (connected) as</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span><span class="comment">   *        `on_done_func()` is called.  Not touched on error.</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span><span class="comment">   * @param on_done_func</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span><span class="comment">   *        Completion handler.  See above.  The captured state in this function object shall be freed shortly upon</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span><span class="comment">   *        its completed execution from the unspecified thread.</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno">  233</span><span class="comment">   */</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Task_err&gt;</div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a81426af495ba5a9c832d1ba35fe23ba5">async_accept</a>(<a class="code hl_class" href="classipc_1_1transport_1_1sync__io_1_1Native__socket__stream.html">Peer</a>* target_peer, Task_err&amp;&amp; on_done_func);</div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span> </div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span><span class="comment"></span> </div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno">  240</span><span class="comment">  /// Short-hand for callback called on new peer-to-peer connection; or on unrecoverable error.</span></div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ab5fa8c28eb4dbe2ae2e4f1b25d520857">  241</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ab5fa8c28eb4dbe2ae2e4f1b25d520857">On_peer_accepted_func</a> = flow::async::Task_asio_err;</div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span><span class="comment"></span> </div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span><span class="comment">  /// Short-hand for internally stored PEER-state sync_io::Native_socket_stream in #m_pending_results_q.</span></div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a476652737140b761264000ffa4204e4a">  244</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_typedef" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a476652737140b761264000ffa4204e4a">Peer_ptr</a> = boost::movelib::unique_ptr&lt;Peer&gt;;</div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span><span class="comment"></span> </div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span><span class="comment">   * Data store representing a deficit user async-accept request that had to be saved due to lacking surplus of</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span><span class="comment">   * finalized peer socket handles.  Essentially this stores args to async_accept() which is an</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span><span class="comment">   * async-operating method.  We store them in queue via #Ptr.</span></div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span><span class="comment">   */</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno"><a class="line" href="structipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request.html">  251</a></span>  <span class="keyword">struct </span><a class="code hl_struct" href="structipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request.html">User_request</a></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span>  {<span class="comment"></span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span><span class="comment">    /// Short-hand for `unique_ptr` to this.</span></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno"><a class="line" href="structipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request.html#a79784f3221898aee3ab977186565b5d2">  254</a></span><span class="comment"></span>    <span class="keyword">using </span><a class="code hl_typedef" href="structipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request.html#a79784f3221898aee3ab977186565b5d2">Ptr</a> = boost::movelib::unique_ptr&lt;User_request&gt;;</div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span> </div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span>    <span class="comment">// Data.</span></div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span><span class="comment"></span> </div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno">  258</span><span class="comment">    /// See Native_socket_stream_acceptor::async_accept() `target_peer`.</span></div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno"><a class="line" href="structipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request.html#a8c8eae7aa61cb5e00f2af65aa08daa26">  259</a></span><span class="comment"></span>    <a class="code hl_class" href="classipc_1_1transport_1_1sync__io_1_1Native__socket__stream.html">Peer</a>* <a class="code hl_variable" href="structipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request.html#a8c8eae7aa61cb5e00f2af65aa08daa26">m_target_peer</a>;</div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span><span class="comment"></span> </div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno">  261</span><span class="comment">    /// See Native_socket_stream_acceptor::async_accept() `on_done_func`.</span></div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno"><a class="line" href="structipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request.html#a87a4c2b2f1f4441c95e1ab65c6668259">  262</a></span><span class="comment"></span>    <a class="code hl_typedef" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ab5fa8c28eb4dbe2ae2e4f1b25d520857">On_peer_accepted_func</a> <a class="code hl_variable" href="structipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request.html#a87a4c2b2f1f4441c95e1ab65c6668259">m_on_done_func</a>;</div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span>  }; <span class="comment">// struct User_request</span></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span> </div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span><span class="comment"></span> </div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno">  267</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span><span class="comment">   * Non-template impl of async_accept().</span></div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span><span class="comment">   *</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno">  270</span><span class="comment">   * @param target_peer</span></div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span><span class="comment">   *        See async_accept().</span></div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span><span class="comment">   * @param on_done_func</span></div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span><span class="comment">   *        See async_accept().</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span><span class="comment">   */</span></div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a2063fff89b58cc5b07ee7651f9e42366">async_accept_impl</a>(<a class="code hl_class" href="classipc_1_1transport_1_1sync__io_1_1Native__socket__stream.html">Peer</a>* target_peer, <a class="code hl_typedef" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ab5fa8c28eb4dbe2ae2e4f1b25d520857">On_peer_accepted_func</a>&amp;&amp; on_done_func);</div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span><span class="comment"></span> </div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno">  277</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span><span class="comment">   * Handler for incoming connection on #m_acceptor.</span></div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno">  279</span><span class="comment">   *</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span><span class="comment">   * @param sys_err_code</span></div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span><span class="comment">   *        Result code from boost.asio.</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span><span class="comment">   */</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#af52346c8df9efc457efaec35bc6c0807">on_next_peer_socket_or_error</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; sys_err_code);</div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span><span class="comment"></span> </div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno">  285</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span><span class="comment">   * In thread W, in steady state, introduces the just-established peer socket handle into the state machine and</span></div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno">  287</span><span class="comment">   * synchronously advances the state machine into steady state again, with the possible side effect of synchronously</span></div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span><span class="comment">   * invoking the head waiting async-accept user request, if any.  The result, if not emitted, is enqueued to</span></div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span><span class="comment">   * #m_pending_results_q for emission to the next request if any.</span></div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span><span class="comment">   *</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span><span class="comment">   * Pre-condition: Incoming-direction state machine is in steady state; we are in thread W;</span></div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span><span class="comment">   * #m_next_peer_socket is finalized and not empty.</span></div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno">  293</span><span class="comment">   */</span></div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ab9744191a6b5d7d05b7b2b96fcda84d6">finalize_q_surplus_on_success</a>();</div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno">  295</span><span class="comment"></span> </div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno">  296</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno">  297</span><span class="comment">   * In thread W, in steady state *except* for an `Error_code` just pushed to the back of #m_pending_results_q and</span></div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span><span class="comment">   * thus introduced into the state machine, synchronously advances the state machine into steady state again, with the</span></div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno">  299</span><span class="comment">   * possible side effect of synchronously invoking *all* waiting async-accept user requests, if any.</span></div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span><span class="comment">   * In particular, #m_pending_user_requests_q becomes empty if it was not, while #m_pending_results_q is not changed;</span></div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno">  301</span><span class="comment">   * in particular the just-pushed `Error_code` remains saved to be emitted to any future async-accept user requests.</span></div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span><span class="comment">   *</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno">  303</span><span class="comment">   * It is essential to understand the pre-condition that the state machine must be in steady state, followed by</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno">  304</span><span class="comment">   * exactly one modification to it: namely `Error_code` being pushed onto #m_pending_results_q.  For example it is</span></div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span><span class="comment">   * a bug for #m_pending_user_requests_q to be non-empty, if the pre-push #m_pending_results_q is</span></div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno">  306</span><span class="comment">   * non-empty also; that isn&#39;t steady state since both a deficit and a surplus</span></div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno">  307</span><span class="comment">   * were in effect before the `Error_code` was pushed.  In other words: this method takes an inductive step only;</span></div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span><span class="comment">   * it doesn&#39;t &quot;flush&quot; the state machine.</span></div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno">  309</span><span class="comment">   */</span></div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a6c7c14574c041bcfd1ccb45137b486b4">finalize_q_surplus_on_error</a>();</div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span><span class="comment"></span> </div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span><span class="comment">   * In thread W, gets back to steady state by feeding the given #Error_code (which must be the sole element in</span></div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno">  314</span><span class="comment">   * #m_pending_results_q) to all queued user requests, popping them all.  The pre-condition is that doing so *would*</span></div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno">  315</span><span class="comment">   * in fact get the deficit and surplus queues collectively to steady state; and also that there *is* in fact</span></div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno">  316</span><span class="comment">   * a deficit (at least one request in #m_pending_user_requests_q).</span></div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno">  317</span><span class="comment">   *</span></div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno">  318</span><span class="comment">   * @param err_code</span></div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno">  319</span><span class="comment">   *        The code to feed (must be at top of #m_pending_results_q).  This is supplied as an arg for perf at most.</span></div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno">  320</span><span class="comment">   */</span></div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno">  321</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a8ff2e85b30532cb9778aa43c01931955">feed_error_result_to_deficit</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">Error_code</a>&amp; err_code);</div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno">  322</span><span class="comment"></span> </div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno">  323</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno">  324</span><span class="comment">   * In thread W, gets back to steady state by feeding the given just-connected peer socket (which must have just been</span></div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno">  325</span><span class="comment">   * popped from #m_pending_results_q) to the first queued user request, popping it.</span></div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno">  326</span><span class="comment">   *</span></div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno">  327</span><span class="comment">   * @param peer</span></div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno">  328</span><span class="comment">   *        The peer stream handle to feed (must have just been popped from #m_pending_results_q).</span></div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno">  329</span><span class="comment">   */</span></div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno">  330</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#af1ca26531b9dd649046086e4e17f0ba3">feed_success_result_to_deficit</a>(<a class="code hl_typedef" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a476652737140b761264000ffa4204e4a">Peer_ptr</a>&amp;&amp; peer);</div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno">  331</span> </div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno">  332</span>  <span class="comment">// Data.</span></div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno">  333</span><span class="comment"></span> </div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno">  334</span><span class="comment">  /// See absolute_name().</span></div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a35785c842d668ee13f556580d0045511">  335</a></span><span class="comment"></span>  <span class="keyword">const</span> <a class="code hl_class" href="classipc_1_1util_1_1Shared__name.html">Shared_name</a> <a class="code hl_variable" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a35785c842d668ee13f556580d0045511">m_absolute_name</a>;</div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno">  336</span><span class="comment"></span> </div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno">  337</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno">  338</span><span class="comment">   * Queue storing deficit async-accept requests queued up due to lacking pending ready peer socket handles in</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno">  339</span><span class="comment">   * #m_pending_results_q at async_accept() time.  In steady state the invariant is: either #m_pending_user_requests_q</span></div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno">  340</span><span class="comment">   * is empty, or #m_pending_results_q is empty, or both are empty.  If in non-steady state each has at least one</span></div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno">  341</span><span class="comment">   * handle, then any handles in #m_pending_results_q are &quot;fed&quot; to the callbacks in #m_pending_user_requests_q, thus</span></div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno">  342</span><span class="comment">   * removing that number of entries in each queue and emptying #m_pending_results_q.</span></div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno">  343</span><span class="comment">   *</span></div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno">  344</span><span class="comment">   * Accessed from thread W only; hence needs no locking.</span></div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno">  345</span><span class="comment">   */</span></div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a5d2e731d023d9c6465e01fa84a6e5138">  346</a></span>  std::queue&lt;User_request::Ptr&gt; <a class="code hl_variable" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a5d2e731d023d9c6465e01fa84a6e5138">m_pending_user_requests_q</a>;</div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno">  347</span><span class="comment"></span> </div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno">  348</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno">  349</span><span class="comment">   * Queue storing surplus finalized async-accept results queued up due to lacking async_accept() requests in</span></div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno">  350</span><span class="comment">   * #m_pending_user_requests_q at connection finalization time.  There are 0+ peer socket handles, capped by 0 or 1</span></div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno">  351</span><span class="comment">   * `Error_code`.</span></div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno">  352</span><span class="comment">   *</span></div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno">  353</span><span class="comment">   * Accessed from thread W only; hence needs no locking.</span></div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno">  354</span><span class="comment">   */</span></div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ac04049d9b4c38f2a46d7f26192b17b69">  355</a></span>  std::queue&lt;std::variant&lt;Peer_ptr, Error_code&gt;&gt; <a class="code hl_variable" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ac04049d9b4c38f2a46d7f26192b17b69">m_pending_results_q</a>;</div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno">  356</span><span class="comment"></span> </div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno">  357</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno">  358</span><span class="comment">   * A single-threaded async task loop that starts in constructor and ends in destructor.  We refer to this informally</span></div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno">  359</span><span class="comment">   * as thread W in comments.</span></div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno">  360</span><span class="comment">   *</span></div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno">  361</span><span class="comment">   * Ordering: Should be declared before #m_acceptor: It should destruct before its attached `Task_engine` does.</span></div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno">  362</span><span class="comment">   */</span></div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a2d397e09f2cfa198313ff5c31334080b">  363</a></span>  flow::async::Single_thread_task_loop <a class="code hl_variable" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a2d397e09f2cfa198313ff5c31334080b">m_worker</a>;</div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno">  364</span><span class="comment"></span> </div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno">  365</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno">  366</span><span class="comment">   * Unix domain socket acceptor.  It is only accessed in thread W.  Assuming successful setup, it&#39;s listening</span></div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno">  367</span><span class="comment">   * continuously in thread W, via async loop #m_worker.</span></div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno">  368</span><span class="comment">   */</span></div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a946663a2ab4070babdc80091f5adfb28">  369</a></span>  boost::movelib::unique_ptr&lt;asio_local_stream_socket::Acceptor&gt; <a class="code hl_variable" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a946663a2ab4070babdc80091f5adfb28">m_acceptor</a>;</div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno">  370</span><span class="comment"></span> </div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno">  371</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno">  372</span><span class="comment">   * Unix domain peer socket, always empty/unconnected while a background `m_acceptor.async_accept()` is proceeding;</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno">  373</span><span class="comment">   * then (assuming a successful accept op) connected at the start to the `async_accept()` callback; then back to</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno">  374</span><span class="comment">   * empty/unconnected again just before the next `async_accept()` call; and so on.  Only accessed in thread W.</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno">  375</span><span class="comment">   *</span></div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno">  376</span><span class="comment">   * Since there&#39;s only one thread, we can keep reusing this one target socket.  When the time comes (in the callback)</span></div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno">  377</span><span class="comment">   * to pass it to the rest of the program, a &quot;new&quot; socket is move-constructed from it, thus making it</span></div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno">  378</span><span class="comment">   * empty/unconnected again.</span></div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno">  379</span><span class="comment">   *</span></div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno">  380</span><span class="comment">   * ### Rationale/notes ###</span></div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno">  381</span><span class="comment">   * As noted, this setup relies on move-construction.  Alternatively we could have used a `shared_ptr` pattern.</span></div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno">  382</span><span class="comment">   * Stylistically it should be at least as simple/elegant.  Perf-wise, as of this writing, I (ygoldfel) have not</span></div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno">  383</span><span class="comment">   * rigorously compared the two; but by definition move constructions should be close to optimal perf-wise, unless</span></div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno">  384</span><span class="comment">   * boost.asio guys willfully made theirs slow.</span></div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno">  385</span><span class="comment">   *</span></div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno">  386</span><span class="comment">   * @todo Perform a rigorous analysis of the perf and style trade-offs between move-construction-based patterns</span></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno">  387</span><span class="comment">   * versus `shared_ptr`-based ones, possibly focusing on boost.asio socket objects in particular. */</span></div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a7928656e82682f101af9a2fd6d4019cc">  388</a></span>  <a class="code hl_typedef" href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a1788f9dbd896bb71b3693f9ae25b40ae">asio_local_stream_socket::Peer_socket</a> <a class="code hl_variable" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a7928656e82682f101af9a2fd6d4019cc">m_next_peer_socket</a>;</div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno">  389</span>}; <span class="comment">// class Native_socket_stream_acceptor</span></div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno">  390</span> </div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno">  391</span><span class="comment">// Free functions: in *_fwd.hpp.</span></div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno">  392</span> </div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno">  393</span><span class="comment">// Template implementations.</span></div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno">  394</span> </div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno">  395</span><span class="keyword">template</span>&lt;<span class="keyword">typename</span> Task_err&gt;</div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno"><a class="line" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a81426af495ba5a9c832d1ba35fe23ba5">  396</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a81426af495ba5a9c832d1ba35fe23ba5">Native_socket_stream_acceptor::async_accept</a>(<a class="code hl_class" href="classipc_1_1transport_1_1sync__io_1_1Native__socket__stream.html">Peer</a>* target_peer, Task_err&amp;&amp; on_done_func)</div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno">  397</span>{</div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno">  398</span>  <a class="code hl_function" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a2063fff89b58cc5b07ee7651f9e42366">async_accept_impl</a>(target_peer, <a class="code hl_typedef" href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ab5fa8c28eb4dbe2ae2e4f1b25d520857">On_peer_accepted_func</a>(std::move(on_done_func)));</div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno">  399</span>}</div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno">  400</span> </div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno">  401</span>} <span class="comment">// namespace ipc::transport</span></div>
<div class="ttc" id="aasio__local__stream__socket__fwd_8hpp_html"><div class="ttname"><a href="asio__local__stream__socket__fwd_8hpp.html">asio_local_stream_socket_fwd.hpp</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html">ipc::transport::Native_socket_stream_acceptor</a></div><div class="ttdoc">A server object that binds to a Shared_name and listens for incoming Native_socket_stream connect att...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00102">native_socket_stream_acceptor.hpp:105</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a0de2b6072026584ff1d46538533ed68b"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a0de2b6072026584ff1d46538533ed68b">ipc::transport::Native_socket_stream_acceptor::S_RESOURCE_TYPE_ID</a></div><div class="ttdeci">static const Shared_name &amp; S_RESOURCE_TYPE_ID</div><div class="ttdoc">Shared_name relative-folder fragment (no separators) identifying this resource type.</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00120">native_socket_stream_acceptor.hpp:120</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a2063fff89b58cc5b07ee7651f9e42366"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a2063fff89b58cc5b07ee7651f9e42366">ipc::transport::Native_socket_stream_acceptor::async_accept_impl</a></div><div class="ttdeci">void async_accept_impl(Peer *target_peer, On_peer_accepted_func &amp;&amp;on_done_func)</div><div class="ttdoc">Non-template impl of async_accept().</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8cpp_source.html#l00310">native_socket_stream_acceptor.cpp:310</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a2d397e09f2cfa198313ff5c31334080b"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a2d397e09f2cfa198313ff5c31334080b">ipc::transport::Native_socket_stream_acceptor::m_worker</a></div><div class="ttdeci">flow::async::Single_thread_task_loop m_worker</div><div class="ttdoc">A single-threaded async task loop that starts in constructor and ends in destructor.</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00363">native_socket_stream_acceptor.hpp:363</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a35785c842d668ee13f556580d0045511"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a35785c842d668ee13f556580d0045511">ipc::transport::Native_socket_stream_acceptor::m_absolute_name</a></div><div class="ttdeci">const Shared_name m_absolute_name</div><div class="ttdoc">See absolute_name().</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00335">native_socket_stream_acceptor.hpp:335</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a476652737140b761264000ffa4204e4a"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a476652737140b761264000ffa4204e4a">ipc::transport::Native_socket_stream_acceptor::Peer_ptr</a></div><div class="ttdeci">boost::movelib::unique_ptr&lt; Peer &gt; Peer_ptr</div><div class="ttdoc">Short-hand for internally stored PEER-state sync_io::Native_socket_stream in m_pending_results_q.</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00244">native_socket_stream_acceptor.hpp:244</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a5d2e731d023d9c6465e01fa84a6e5138"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a5d2e731d023d9c6465e01fa84a6e5138">ipc::transport::Native_socket_stream_acceptor::m_pending_user_requests_q</a></div><div class="ttdeci">std::queue&lt; User_request::Ptr &gt; m_pending_user_requests_q</div><div class="ttdoc">Queue storing deficit async-accept requests queued up due to lacking pending ready peer socket handle...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00346">native_socket_stream_acceptor.hpp:346</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a6c7c14574c041bcfd1ccb45137b486b4"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a6c7c14574c041bcfd1ccb45137b486b4">ipc::transport::Native_socket_stream_acceptor::finalize_q_surplus_on_error</a></div><div class="ttdeci">void finalize_q_surplus_on_error()</div><div class="ttdoc">In thread W, in steady state except for an Error_code just pushed to the back of m_pending_results_q ...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8cpp_source.html#l00378">native_socket_stream_acceptor.cpp:378</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a71e907b904bcc8aff0042ca7efcc783b"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a71e907b904bcc8aff0042ca7efcc783b">ipc::transport::Native_socket_stream_acceptor::~Native_socket_stream_acceptor</a></div><div class="ttdeci">~Native_socket_stream_acceptor()</div><div class="ttdoc">Destroys this acceptor which will stop listening in the background and cancel any pending completion ...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8cpp_source.html#l00131">native_socket_stream_acceptor.cpp:131</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a77795acb028a95a4804f9b3ef18d99b0"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a77795acb028a95a4804f9b3ef18d99b0">ipc::transport::Native_socket_stream_acceptor::Native_socket_stream_acceptor</a></div><div class="ttdeci">Native_socket_stream_acceptor(flow::log::Logger *logger_ptr, const Shared_name &amp;absolute_name, Error_code *err_code=0)</div><div class="ttdoc">Creates the Native_socket_stream_acceptor and immediately begins listening in the background,...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8cpp_source.html#l00037">native_socket_stream_acceptor.cpp:37</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a7928656e82682f101af9a2fd6d4019cc"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a7928656e82682f101af9a2fd6d4019cc">ipc::transport::Native_socket_stream_acceptor::m_next_peer_socket</a></div><div class="ttdeci">asio_local_stream_socket::Peer_socket m_next_peer_socket</div><div class="ttdoc">Unix domain peer socket, always empty/unconnected while a background m_acceptor.async_accept() is pro...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00388">native_socket_stream_acceptor.hpp:388</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a81426af495ba5a9c832d1ba35fe23ba5"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a81426af495ba5a9c832d1ba35fe23ba5">ipc::transport::Native_socket_stream_acceptor::async_accept</a></div><div class="ttdeci">void async_accept(Peer *target_peer, Task_err &amp;&amp;on_done_func)</div><div class="ttdoc">Asynchronously awaits for a peer connection to be established and calls on_done_func(),...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00396">native_socket_stream_acceptor.hpp:396</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a8ff2e85b30532cb9778aa43c01931955"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a8ff2e85b30532cb9778aa43c01931955">ipc::transport::Native_socket_stream_acceptor::feed_error_result_to_deficit</a></div><div class="ttdeci">void feed_error_result_to_deficit(const Error_code &amp;err_code)</div><div class="ttdoc">In thread W, gets back to steady state by feeding the given Error_code (which must be the sole elemen...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8cpp_source.html#l00435">native_socket_stream_acceptor.cpp:435</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_a946663a2ab4070babdc80091f5adfb28"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#a946663a2ab4070babdc80091f5adfb28">ipc::transport::Native_socket_stream_acceptor::m_acceptor</a></div><div class="ttdeci">boost::movelib::unique_ptr&lt; asio_local_stream_socket::Acceptor &gt; m_acceptor</div><div class="ttdoc">Unix domain socket acceptor.</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00369">native_socket_stream_acceptor.hpp:369</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_ab5fa8c28eb4dbe2ae2e4f1b25d520857"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ab5fa8c28eb4dbe2ae2e4f1b25d520857">ipc::transport::Native_socket_stream_acceptor::On_peer_accepted_func</a></div><div class="ttdeci">flow::async::Task_asio_err On_peer_accepted_func</div><div class="ttdoc">Short-hand for callback called on new peer-to-peer connection; or on unrecoverable error.</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00241">native_socket_stream_acceptor.hpp:241</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_ab9744191a6b5d7d05b7b2b96fcda84d6"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ab9744191a6b5d7d05b7b2b96fcda84d6">ipc::transport::Native_socket_stream_acceptor::finalize_q_surplus_on_success</a></div><div class="ttdeci">void finalize_q_surplus_on_success()</div><div class="ttdoc">In thread W, in steady state, introduces the just-established peer socket handle into the state machi...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8cpp_source.html#l00406">native_socket_stream_acceptor.cpp:406</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_ac04049d9b4c38f2a46d7f26192b17b69"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ac04049d9b4c38f2a46d7f26192b17b69">ipc::transport::Native_socket_stream_acceptor::m_pending_results_q</a></div><div class="ttdeci">std::queue&lt; std::variant&lt; Peer_ptr, Error_code &gt; &gt; m_pending_results_q</div><div class="ttdoc">Queue storing surplus finalized async-accept results queued up due to lacking async_accept() requests...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00355">native_socket_stream_acceptor.hpp:355</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_ac5b70ff8230fa49c99ccb6954db71c75"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#ac5b70ff8230fa49c99ccb6954db71c75">ipc::transport::Native_socket_stream_acceptor::absolute_name</a></div><div class="ttdeci">const Shared_name &amp; absolute_name() const</div><div class="ttdoc">Returns the full name/address to which the constructor bound, or attempted to bind,...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8cpp_source.html#l00465">native_socket_stream_acceptor.cpp:465</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_af1ca26531b9dd649046086e4e17f0ba3"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#af1ca26531b9dd649046086e4e17f0ba3">ipc::transport::Native_socket_stream_acceptor::feed_success_result_to_deficit</a></div><div class="ttdeci">void feed_success_result_to_deficit(Peer_ptr &amp;&amp;peer)</div><div class="ttdoc">In thread W, gets back to steady state by feeding the given just-connected peer socket (which must ha...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8cpp_source.html#l00452">native_socket_stream_acceptor.cpp:452</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream__acceptor_html_af52346c8df9efc457efaec35bc6c0807"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream__acceptor.html#af52346c8df9efc457efaec35bc6c0807">ipc::transport::Native_socket_stream_acceptor::on_next_peer_socket_or_error</a></div><div class="ttdeci">void on_next_peer_socket_or_error(const Error_code &amp;sys_err_code)</div><div class="ttdoc">Handler for incoming connection on m_acceptor.</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8cpp_source.html#l00181">native_socket_stream_acceptor.cpp:181</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Native__socket__stream_html_a850af22a95f27d8696b9b5bca15454b5"><div class="ttname"><a href="classipc_1_1transport_1_1Native__socket__stream.html#a850af22a95f27d8696b9b5bca15454b5">ipc::transport::Native_socket_stream::Sync_io_obj</a></div><div class="ttdeci">sync_io::Native_socket_stream Sync_io_obj</div><div class="ttdoc">Useful for generic programming, the sync_io-pattern counterpart to *this type.</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream_8hpp_source.html#l00276">native_socket_stream.hpp:276</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1Null__peer_html"><div class="ttname"><a href="classipc_1_1transport_1_1Null__peer.html">ipc::transport::Null_peer</a></div><div class="ttdoc">Dummy type for use as a template param to Channel when either the blobs pipe or handles pipe is disab...</div><div class="ttdef"><b>Definition:</b> <a href="ipc__core_2src_2ipc_2transport_2channel_8hpp_source.html#l00999">channel.hpp:1000</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Native__socket__stream__acceptor_html"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Native__socket__stream__acceptor.html">ipc::transport::sync_io::Native_socket_stream_acceptor</a></div><div class="ttdoc">sync_io-pattern counterpart to async-I/O-pattern transport::Native_socket_stream_acceptor.</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2native__socket__stream__acceptor_8hpp_source.html#l00058">native_socket_stream_acceptor.hpp:61</a></div></div>
<div class="ttc" id="aclassipc_1_1transport_1_1sync__io_1_1Native__socket__stream_html"><div class="ttname"><a href="classipc_1_1transport_1_1sync__io_1_1Native__socket__stream.html">ipc::transport::sync_io::Native_socket_stream</a></div><div class="ttdoc">Implements both sync_io::Native_handle_sender and sync_io::Native_handle_receiver concepts by using a...</div><div class="ttdef"><b>Definition:</b> <a href="sync__io_2native__socket__stream_8hpp_source.html#l00150">native_socket_stream.hpp:151</a></div></div>
<div class="ttc" id="aclassipc_1_1util_1_1Shared__name_html"><div class="ttname"><a href="classipc_1_1util_1_1Shared__name.html">ipc::util::Shared_name</a></div><div class="ttdoc">String-wrapping abstraction representing a name uniquely distinguishing a kernel-persistent entity fr...</div><div class="ttdef"><b>Definition:</b> <a href="shared__name_8hpp_source.html#l00241">shared_name.hpp:242</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_1_1asio__local__stream__socket_html_a1788f9dbd896bb71b3693f9ae25b40ae"><div class="ttname"><a href="namespaceipc_1_1transport_1_1asio__local__stream__socket.html#a1788f9dbd896bb71b3693f9ae25b40ae">ipc::transport::asio_local_stream_socket::Peer_socket</a></div><div class="ttdeci">Protocol::socket Peer_socket</div><div class="ttdoc">Short-hand for boost.asio Unix domain peer stream-socket (usually-connected-or-empty guy).</div><div class="ttdef"><b>Definition:</b> <a href="asio__local__stream__socket__fwd_8hpp_source.html#l00114">asio_local_stream_socket_fwd.hpp:114</a></div></div>
<div class="ttc" id="anamespaceipc_1_1transport_html"><div class="ttname"><a href="namespaceipc_1_1transport.html">ipc::transport</a></div><div class="ttdoc">Flow-IPC module providing transmission of structured messages and/or low-level blobs (and more) betwe...</div><div class="ttdef"><b>Definition:</b> <a href="asio__local__stream__socket_8cpp_source.html#l00031">asio_local_stream_socket.cpp:32</a></div></div>
<div class="ttc" id="anamespaceipc_html_aa3192e586cc45d3e7c22463bf2760f89"><div class="ttname"><a href="namespaceipc.html#aa3192e586cc45d3e7c22463bf2760f89">ipc::Error_code</a></div><div class="ttdeci">flow::Error_code Error_code</div><div class="ttdoc">Short-hand for flow::Error_code which is very common.</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00298">common.hpp:298</a></div></div>
<div class="ttc" id="anative__socket__stream_8hpp_html"><div class="ttname"><a href="native__socket__stream_8hpp.html">native_socket_stream.hpp</a></div></div>
<div class="ttc" id="ashared__name_8hpp_html"><div class="ttname"><a href="shared__name_8hpp.html">shared_name.hpp</a></div></div>
<div class="ttc" id="astructipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request_html"><div class="ttname"><a href="structipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request.html">ipc::transport::Native_socket_stream_acceptor::User_request</a></div><div class="ttdoc">Data store representing a deficit user async-accept request that had to be saved due to lacking surpl...</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00251">native_socket_stream_acceptor.hpp:252</a></div></div>
<div class="ttc" id="astructipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request_html_a79784f3221898aee3ab977186565b5d2"><div class="ttname"><a href="structipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request.html#a79784f3221898aee3ab977186565b5d2">ipc::transport::Native_socket_stream_acceptor::User_request::Ptr</a></div><div class="ttdeci">boost::movelib::unique_ptr&lt; User_request &gt; Ptr</div><div class="ttdoc">Short-hand for unique_ptr to this.</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00254">native_socket_stream_acceptor.hpp:254</a></div></div>
<div class="ttc" id="astructipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request_html_a87a4c2b2f1f4441c95e1ab65c6668259"><div class="ttname"><a href="structipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request.html#a87a4c2b2f1f4441c95e1ab65c6668259">ipc::transport::Native_socket_stream_acceptor::User_request::m_on_done_func</a></div><div class="ttdeci">On_peer_accepted_func m_on_done_func</div><div class="ttdoc">See Native_socket_stream_acceptor::async_accept() on_done_func.</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00262">native_socket_stream_acceptor.hpp:262</a></div></div>
<div class="ttc" id="astructipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request_html_a8c8eae7aa61cb5e00f2af65aa08daa26"><div class="ttname"><a href="structipc_1_1transport_1_1Native__socket__stream__acceptor_1_1User__request.html#a8c8eae7aa61cb5e00f2af65aa08daa26">ipc::transport::Native_socket_stream_acceptor::User_request::m_target_peer</a></div><div class="ttdeci">Peer * m_target_peer</div><div class="ttdoc">See Native_socket_stream_acceptor::async_accept() target_peer.</div><div class="ttdef"><b>Definition:</b> <a href="native__socket__stream__acceptor_8hpp_source.html#l00259">native_socket_stream_acceptor.hpp:259</a></div></div>
<div class="ttc" id="atransport__fwd_8hpp_html"><div class="ttname"><a href="transport__fwd_8hpp.html">transport_fwd.hpp</a></div></div>
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